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<h1 class="title">fademessage.cpp 示例文件</h1>
<span class="subtitle">effects/fademessage/fademessage.cpp</span>
<!-- $$$effects/fademessage/fademessage.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
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  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
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  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;fademessage.h&quot;</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>

  FadeMessage<span class="operator">::</span>FadeMessage(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent): <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>(parent)
  {
      setScene(<span class="operator">&amp;</span>m_scene);
      setHorizontalScrollBarPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
      setVerticalScrollBarPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);

      setupScene();

      m_animation <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qpropertyanimation.html">QPropertyAnimation</a></span>(m_effect<span class="operator">,</span> <span class="string">&quot;strength&quot;</span><span class="operator">,</span> <span class="keyword">this</span>);
      m_animation<span class="operator">-</span><span class="operator">&gt;</span>setDuration(<span class="number">500</span>);
      m_animation<span class="operator">-</span><span class="operator">&gt;</span>setEasingCurve(<span class="type"><a href="../qtcore/qeasingcurve.html">QEasingCurve</a></span><span class="operator">::</span>InOutSine);
      m_animation<span class="operator">-</span><span class="operator">&gt;</span>setStartValue(<span class="number">0</span>);
      m_animation<span class="operator">-</span><span class="operator">&gt;</span>setEndValue(<span class="number">1</span>);

      setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>);
      setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>NoFrame);
  }

  <span class="type">void</span> FadeMessage<span class="operator">::</span>togglePopup()
  {
      <span class="keyword">if</span> (m_message<span class="operator">-</span><span class="operator">&gt;</span>isVisible()) {
          m_message<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">false</span>);
          m_animation<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span><span class="operator">::</span>Backward);
      } <span class="keyword">else</span> {
          m_message<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">true</span>);
          m_animation<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span><span class="operator">::</span>Forward);
      }
      m_animation<span class="operator">-</span><span class="operator">&gt;</span>start();
  }

  <span class="type">void</span> FadeMessage<span class="operator">::</span>setupScene()
  {
      <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span> <span class="operator">*</span>parent <span class="operator">=</span> m_scene<span class="operator">.</span>addRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">800</span><span class="operator">,</span> <span class="number">600</span>);
      parent<span class="operator">-</span><span class="operator">&gt;</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen);
      parent<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">0</span>);

      <span class="type"><a href="qgraphicspixmapitem.html">QGraphicsPixmapItem</a></span> <span class="operator">*</span>bg <span class="operator">=</span> m_scene<span class="operator">.</span>addPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/background.jpg&quot;</span>));
      bg<span class="operator">-</span><span class="operator">&gt;</span>setParentItem(parent);
      bg<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="operator">-</span><span class="number">1</span>);

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>i)
          <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">2</span>; j <span class="operator">&lt;</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>j) {
              <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> m_scene<span class="operator">.</span>addRect(i <span class="operator">*</span> <span class="number">50</span><span class="operator">,</span> (j <span class="operator">-</span> <span class="number">1</span>) <span class="operator">*</span> <span class="number">50</span><span class="operator">,</span> <span class="number">38</span><span class="operator">,</span> <span class="number">38</span>);
              item<span class="operator">-</span><span class="operator">&gt;</span>setParentItem(parent);
              item<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">1</span>);
              <span class="type">int</span> hue <span class="operator">=</span> <span class="number">12</span> <span class="operator">*</span> (i <span class="operator">*</span> <span class="number">5</span> <span class="operator">+</span> j);
              item<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span><span class="operator">::</span>fromHsv(hue<span class="operator">,</span> <span class="number">128</span><span class="operator">,</span> <span class="number">128</span>));
          }

      <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font;
      font<span class="operator">.</span>setPointSize(font<span class="operator">.</span>pointSize() <span class="operator">*</span> <span class="number">2</span>);
      font<span class="operator">.</span>setBold(<span class="keyword">true</span>);
      <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fontMetrics(font);
      <span class="type">int</span> fh <span class="operator">=</span> fontMetrics<span class="operator">.</span>height();

      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> sceneText <span class="operator">=</span> <span class="string">&quot;Qt Everywhere!&quot;</span>;
      <span class="type">int</span> sceneTextWidth <span class="operator">=</span> fontMetrics<span class="operator">.</span>horizontalAdvance(sceneText);

      <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span> <span class="operator">*</span>block <span class="operator">=</span> m_scene<span class="operator">.</span>addRect(<span class="number">50</span><span class="operator">,</span> <span class="number">300</span><span class="operator">,</span> sceneTextWidth<span class="operator">,</span> fh <span class="operator">+</span> <span class="number">3</span>);
      block<span class="operator">-</span><span class="operator">&gt;</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen);
      block<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">102</span><span class="operator">,</span> <span class="number">153</span><span class="operator">,</span> <span class="number">51</span>));

      <span class="type"><a href="qgraphicstextitem.html">QGraphicsTextItem</a></span> <span class="operator">*</span>text <span class="operator">=</span> m_scene<span class="operator">.</span>addText(sceneText<span class="operator">,</span> font);
      text<span class="operator">-</span><span class="operator">&gt;</span>setDefaultTextColor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
      text<span class="operator">-</span><span class="operator">&gt;</span>setPos(<span class="number">50</span><span class="operator">,</span> <span class="number">300</span>);
      block<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">2</span>);
      block<span class="operator">-</span><span class="operator">&gt;</span>hide();

      text<span class="operator">-</span><span class="operator">&gt;</span>setParentItem(block);
      m_message <span class="operator">=</span> block;

      m_effect <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicscolorizeeffect.html">QGraphicsColorizeEffect</a></span>;
      m_effect<span class="operator">-</span><span class="operator">&gt;</span>setColor(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">122</span><span class="operator">,</span> <span class="number">193</span><span class="operator">,</span> <span class="number">66</span>));
      m_effect<span class="operator">-</span><span class="operator">&gt;</span>setStrength(<span class="number">0</span>);
      m_effect<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
      parent<span class="operator">-</span><span class="operator">&gt;</span>setGraphicsEffect(m_effect);

      <span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>press <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>;
      press<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Press me&quot;</span>));
      connect(press<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(togglePopup()));
      m_scene<span class="operator">.</span>addWidget(press);

      press<span class="operator">-</span><span class="operator">&gt;</span>move(<span class="number">300</span><span class="operator">,</span> <span class="number">500</span>);
  }

</pre>
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<!-- @@@effects/fademessage/fademessage.cpp -->
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